Editor's Note: A previous version of this story has been updated to include the correct number of Qdoba units, which is 564. Soup is one of the few comfort foods that also has a health halo. Usually warm and reassuring, yet often light, refreshing and generally affordable, it strikes a chord with consumers in many ways and on many occasions.
 But whether a restaurant is a specialist in soup or is using it to boost incremental sales, clever strategies make a big difference, operators ...

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